Audible alarm for security units



FIG. 1 is a front elevational view of an audible alarm for security units showing our new design, with the rear being flat and unornamented.

FIG. 2 is a front, bottom, left side perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof, the right side elevational view being a mirror image; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an audible alarm for security units, as shown and described. 